const NProgress = {};

NProgress.version = "0.2.0";

var Settings = (NProgress.settings = {
    minimum: 0.08,
    easing: "linear",
    positionUsing: "",
    speed: 200,
    trickle: true,
    trickleSpeed: 200,
    showSpinner: true,
    barSelector: '[role="bar"]',
    spinnerSelector: '[role="spinner"]',
    parent: "body",
    template: '<div class="bar" role="bar"><div class="peg"></div></div><div class="spinner" role="spinner"><div class="spinner-icon"></div></div>',
});

/**
 * Updates configuration.
 *
 *     NProgress.configure({
 *       minimum: 0.1
 *     });
 */
NProgress.configure = function (options) {
    var key, value;
    for (key in options) {
        value = options[key];
        if (value !== undefined && options.hasOwnProperty(key))
            Settings[key] = value;
    }

    return this;
};

/**
 * Last number.
 */

NProgress.status = null;

/**
 * Sets the progress bar status, where `n` is a number from `0.0` to `1.0`.
 * @param {number} n
 * @example
 *     NProgress.set(0.4);
 *     NProgress.set(1.0);
 */

NProgress.set = function (n) {
    var started = NProgress.isStarted();

    n = clamp(n, Settings.minimum, 1);
    NProgress.status = n === 1 ? null : n;

    var progress = NProgress.render(!started),
        bar = progress.querySelector(Settings.barSelector),
        speed = Settings.speed,
        ease = Settings.easing;

    progress.offsetWidth; /* Repaint */

    queue(function (next) {
        // Set positionUsing if it hasn't already been set
        if (Settings.positionUsing === "")
            Settings.positionUsing = NProgress.getPositioningCSS();

        // Add transition
        css(bar, barPositionCSS(n, speed, ease));

        if (n === 1) {
            // Fade out
            css(progress, {
                transition: "none",
                opacity: 1,
            });
            progress.offsetWidth; /* Repaint */

            setTimeout(function () {
                css(progress, {
                    transition: "all " + speed + "ms linear",
                    opacity: 0,
                });
                setTimeout(function () {
                    NProgress.remove();
                    next();
                }, speed);
            }, speed);
        } else {
            setTimeout(next, speed);
        }
    });

    return this;
};

NProgress.isStarted = function () {
    return typeof NProgress.status === "number";
};

/**
 * Shows the progress bar.
 * This is the same as setting the status to 0%, except that it doesn't go backwards.
 *
 * @example
 *     NProgress.start();
 */

NProgress.start = function () {
    if (!NProgress.status) NProgress.set(0);

    var work = function () {
        setTimeout(function () {
            if (!NProgress.status) return;
            NProgress.trickle();
            work();
        }, Settings.trickleSpeed);
    };

    if (Settings.trickle) work();

    return this;
};

/**
 * Hides the progress bar.
 * This is the *sort of* the same as setting the status to 100%, with the
 * difference being `done()` makes some placebo effect of some realistic motion.
 *
 *     NProgress.done();
 *
 * If `true` is passed, it will show the progress bar even if its hidden.
 *
 *     NProgress.done(true);
 */

NProgress.done = function (force) {
    if (!force && !NProgress.status) return this;

    return NProgress.inc(0.3 + 0.5 * Math.random()).set(1);
};

/**
 * Increments by a random amount.
 */

NProgress.inc = function (amount) {
    var n = NProgress.status;

    if (!n) {
        return NProgress.start();
    } else if (n > 1) {

    } else {
        if (typeof amount !== "number") {
            if (n >= 0 && n < 0.2) {
                amount = 0.1;
            } else if (n >= 0.2 && n < 0.5) {
                amount = 0.04;
            } else if (n >= 0.5 && n < 0.8) {
                amount = 0.02;
            } else if (n >= 0.8 && n < 0.99) {
                amount = 0.005;
            } else {
                amount = 0;
            }
        }

        n = clamp(n + amount, 0, 0.994);
        return NProgress.set(n);
    }
};

NProgress.trickle = function () {
    return NProgress.inc();
};

/**
 * Waits for all supplied jQuery promises and
 * increases the progress as the promises resolve.
 *
 * @param $promise jQUery Promise
 */
(function () {
    var initial = 0,
        current = 0;

    NProgress.promise = function ($promise) {
        if (!$promise || $promise.state() === "resolved") {
            return this;
        }

        if (current === 0) {
            NProgress.start();
        }

        initial++;
        current++;

        $promise.always(function () {
            current--;
            if (current === 0) {
                initial = 0;
                NProgress.done();
            } else {
                NProgress.set((initial - current) / initial);
            }
        });

        return this;
    };
})();

/**
 * (Internal) renders the progress bar markup based on the `template`
 * setting.
 */

NProgress.render = function (fromStart) {
    if (NProgress.isRendered()) return document.getElementById("nprogress");

    addClass(document.documentElement, "nprogress-busy");

    var progress = document.createElement("div");
    progress.id = "nprogress";
    progress.innerHTML = Settings.template;

    var bar = progress.querySelector(Settings.barSelector),
        perc = fromStart ? "-100" : toBarPerc(NProgress.status || 0),
        parent = document.querySelector(Settings.parent),
        spinner;

    css(bar, {
        transition: "all 0 linear",
        transform: "translate3d(" + perc + "%,0,0)",
    });

    if (!Settings.showSpinner) {
        spinner = progress.querySelector(Settings.spinnerSelector);
        spinner && removeElement(spinner);
    }

    if (parent != document.body) {
        addClass(parent, "nprogress-custom-parent");
    }

    parent.appendChild(progress);
    return progress;
};

/**
 * Removes the element. Opposite of render().
 */

NProgress.remove = function () {
    removeClass(document.documentElement, "nprogress-busy");
    removeClass(
        document.querySelector(Settings.parent),
        "nprogress-custom-parent"
    );
    var progress = document.getElementById("nprogress");
    progress && removeElement(progress);
};

/**
 * Checks if the progress bar is rendered.
 */

NProgress.isRendered = function () {
    return !!document.getElementById("nprogress");
};

/**
 * Determine which positioning CSS rule to use.
 */

NProgress.getPositioningCSS = function () {
    // Sniff on document.body.style
    var bodyStyle = document.body.style;

    // Sniff prefixes
    var vendorPrefix =
        "WebkitTransform" in bodyStyle
            ? "Webkit"
            : "MozTransform" in bodyStyle
            ? "Moz"
            : "msTransform" in bodyStyle
                ? "ms"
                : "OTransform" in bodyStyle
                    ? "O"
                    : "";

    if (vendorPrefix + "Perspective" in bodyStyle) {
        // Modern browsers with 3D support, e.g. Webkit, IE10
        return "translate3d";
    } else if (vendorPrefix + "Transform" in bodyStyle) {
        // Browsers without 3D support, e.g. IE9
        return "translate";
    } else {
        // Browsers without translate() support, e.g. IE7-8
        return "margin";
    }
};

/**
 * Helpers
 */

function clamp(n, min, max) {
    if (n < min) return min;
    if (n > max) return max;
    return n;
}

/**
 * (Internal) converts a percentage (`0..1`) to a bar translateX
 * percentage (`-100%..0%`).
 * @param {Number} n
 */

function toBarPerc(n) {
    return (-1 + n) * 100;
}

/**
 * (Internal) returns the correct CSS for changing the bar's
 * position given an n percentage, and speed and ease from Settings
 */

function barPositionCSS(n, speed, ease) {
    var barCSS;

    if (Settings.positionUsing === "translate3d") {
        barCSS = {transform: "translate3d(" + toBarPerc(n) + "%,0,0)"};
    } else if (Settings.positionUsing === "translate") {
        barCSS = {transform: "translate(" + toBarPerc(n) + "%,0)"};
    } else {
        barCSS = {"margin-left": toBarPerc(n) + "%"};
    }

    barCSS.transition = "all " + speed + "ms " + ease;

    return barCSS;
}

/**
 * (Internal) Queues a function to be executed.
 */

var queue = (function () {
    var pending = [];

    function next() {
        var fn = pending.shift();
        if (fn) {
            fn(next);
        }
    }

    return function (fn) {
        pending.push(fn);
        if (pending.length == 1) next();
    };
})();

/**
 * (Internal) Applies css properties to an element, similar to the jQuery
 * css method.
 *
 * While this helper does assist with vendor prefixed property names, it
 * does not perform any manipulation of values prior to setting styles.
 */

var css = (function () {
    var cssPrefixes = ["Webkit", "O", "Moz", "ms"],
        cssProps = {};

    function camelCase(string) {
        return string
            .replace(/^-ms-/, "ms-")
            .replace(/-([\da-z])/gi, function (match, letter) {
                return letter.toUpperCase();
            });
    }

    function getVendorProp(name) {
        var style = document.body.style;
        if (name in style) return name;

        var i = cssPrefixes.length,
            capName = name.charAt(0).toUpperCase() + name.slice(1),
            vendorName;
        while (i--) {
            vendorName = cssPrefixes[i] + capName;
            if (vendorName in style) return vendorName;
        }

        return name;
    }

    function getStyleProp(name) {
        name = camelCase(name);
        return cssProps[name] || (cssProps[name] = getVendorProp(name));
    }

    function applyCss(element, prop, value) {
        prop = getStyleProp(prop);
        element.style[prop] = value;
    }

    return function (element, properties) {
        var args = arguments,
            prop,
            value;

        if (args.length == 2) {
            for (prop in properties) {
                value = properties[prop];
                if (value !== undefined && properties.hasOwnProperty(prop))
                    applyCss(element, prop, value);
            }
        } else {
            applyCss(element, args[1], args[2]);
        }
    };
})();

/**
 * (Internal) Determines if an element or space separated list of class names
 * contains a class name.
 * @param {Node} element
 * @param {string} name
 */

function hasClass(element, name) {
    var list = typeof element == "string" ? element : classList(element);
    return list.indexOf(" " + name + " ") >= 0;
}

/**
 * (Internal) Adds a class to an element.
 * @param {Node} element
 * @param {string} name
 */

function addClass(element, name) {
    var oldList = classList(element),
        newList = oldList + name;

    if (hasClass(oldList, name)) return;

    // Trim the opening space.
    element.className = newList.substring(1);
}

/**
 * (Internal) Removes a class from an element.
 */

function removeClass(element, name) {
    var oldList = classList(element),
        newList;

    if (!hasClass(element, name)) return;

    // Replace the class name.
    newList = oldList.replace(" " + name + " ", " ");

    // Trim the opening and closing spaces.
    element.className = newList.substring(1, newList.length - 1);
}

/**
 * (Internal) Gets a space separated list of the class names on the element.
 * The list is wrapped with a single space on each end to facilitate finding
 * matches within the list.
 */

function classList(element) {
    return (" " + ((element && element.className) || "") + " ").replace(
        /\s+/gi,
        " "
    );
}

/**
 * (Internal) Removes an element from the DOM.
 */

function removeElement(element) {
    element && element.parentNode && element.parentNode.removeChild(element);
}

// export default NProgress;
layui.define(function (exports) {
    layui.link(layui.cache.base + 'nprogress/nprogress.css');

    exports('nprogress', NProgress);
});